Swift 从 URL Xcode 加载 3d 资产 [英] Swift Load A 3d Asset from URL Xcode
问题描述
我有一个简单的 HTTP 服务器正在运行,我试图从我的本地服务器获取这个场景包,但它显示我 NIL 错误,或错误加载场景.我不明白如何从我的简单本地主机加载这个模型.如何配置我的代码,以便我能够从远程或本地服务器获取任何 Scenekit.
I have a simple HTTP server running and Im trying to fetch this scenekit from my local server but IT shows me NIL error, or Error Loading Scene. I dont understand how to load this model from my simple local host. How to configure my code so that I will be able to fetch any Scenekit from remote or local server.
提前致谢
do {
let shipScene = try SCNScene(url: URL(fileURLWithPath: "http://localhost:8080/chair.scn") , options: nil)
// Set the scene to the view
sceneView.scene = shipScene
let shipNode = shipScene.rootNode.childNodes.first!
shipNode.position = SCNVector3Zero
shipNode.position.z = 0.15
shipNode.position.y = 0
shipNode.position.x = 0
let action = SCNAction.repeatForever(SCNAction.rotate(by: .pi, around: SCNVector3(0, 1, 0), duration: 5))
shipNode.runAction(action)
planeNode.addChildNode(shipNode)
node.addChildNode(planeNode)
} catch {
print("ERROR loading scene")
}
推荐答案
正如@Prashant 所说,您需要先实际下载模型,然后才能使用它.
As @Prashant said you will need to actually download the model first before using it.
因此,您需要做的第一件事是创建一个 URLSession 来下载文件,例如:
The first thing you would need to do therefore is create a URLSession to download the file e.g:
/// Downloads An SCNFile From A Remote URL
func downloadSceneTask(){
//1. Get The URL Of The SCN File
guard let url = URL(string: "http://localhost:8080/chair.scn") else { return }
//2. Create The Download Session
let downloadSession = URLSession(configuration: URLSession.shared.configuration, delegate: self, delegateQueue: nil)
//3. Create The Download Task & Run It
let downloadTask = downloadSession.downloadTask(with: url)
downloadTask.resume()
}
}
然后我们将引用 URLSessionDownloadDelegate
例如:
We will then make reference to the URLSessionDownloadDelegate
e.g.:
class ViewController: UIViewController, URLSessionDownloadDelegate { }
现在我们已经连接了委托,我们需要使用以下回调
将我们下载的文件复制到设备的Documents Directory
:
Now we have the delegate hooked up we need to make use of the following callback
to copy our downloaded file to the Documents Directory
of the device:
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
//1. Create The Filename
let fileURL = getDocumentsDirectory().appendingPathComponent("chair.scn")
//2. Copy It To The Documents Directory
do {
try FileManager.default.copyItem(at: location, to: fileURL)
print("Successfuly Saved File \(fileURL)")
//3. Load The Model
loadModel()
} catch {
print("Error Saving: \(error)")
}
}
请注意,在函数中我使用以下辅助方法来获取文档目录:
Note that in the function I am using the following helper method to get the Documents Directory:
/// Returns The Documents Directory
///
/// - Returns: URL
func getDocumentsDirectory() -> URL {
let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
let documentsDirectory = paths[0]
return documentsDirectory
}
一旦文件被下载并复制过来,我们就会像这样调用我们的loadModel函数
(3):
Once the file has been downloaded and copied across we then call our loadModel function
(3) like so:
/// Loads The SCNFile From The Documents Directory
func loadModel(){
//1. Get The Path Of The Downloaded File
let downloadedScenePath = getDocumentsDirectory().appendingPathComponent("chair.scn")
do {
//2. Load The Scene Remembering The Init Takes ONLY A Local URL
let modelScene = try SCNScene(url: downloadedScenePath, options: nil)
//3. Create A Node To Hold All The Content
let modelHolderNode = SCNNode()
//4. Get All The Nodes From The SCNFile
let nodeArray = modelScene.rootNode.childNodes
//5. Add Them To The Holder Node
for childNode in nodeArray {
modelHolderNode.addChildNode(childNode as SCNNode)
}
//6. Set The Position
modelHolderNode.position = SCNVector3(0, 0, -1.5)
//7. Add It To The Scene
self.augmentedRealityView?.scene.rootNode.addChildNode(modelHolderNode)
} catch {
print("Error Loading Scene")
}
}
希望能帮到你...
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